Retirement Benefit Plans - Expected Future Pension Plan Benefit Payments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Defined Benefit Plan-Pension [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
2013	$ 13,741
2014	14,859
2015	15,735
2016	16,574
2017	17,537
2018-2022	104,740
Total	183,186
Defined Benefit Plan-Pension [Member] \| Qualified [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
2013	12,594
2014	13,721
2015	14,599
2016	15,431
2017	16,376
2018-2022	99,128
Total	171,849
Defined Benefit Plan-Pension [Member] \| Non Qualified [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
2013	1,147
2014	1,138
2015	1,136
2016	1,143
2017	1,161
2018-2022	5,612
Total	11,337
Defined Benefit Plan Postretirement [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
2013	2,205
2014	2,145
2015	2,042
2016	1,984
2017	1,869
2018-2022	9,353
Total	$ 19,598

Defined benefit plan expected future benefit payments.

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- Definition

Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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- Definition

Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan.

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- Definition

Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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- Definition

Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan.

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- Definition

Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

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- Definition

Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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